A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the Char
The application of biosorption in the removal of heavy metals from water faces a challenge of safe disposal of contaminated biomass. In this study, a potential solution for this problem was proposed by using a biosorption-pyrolysis process featured by pretreatment of biomass with phosphoric acid (PA...
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MDPI AG
2020-08-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/9/2381 |
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| author | Yue Wang Jinhong Lü Dongqing Feng Sen Guo Jianfa Li |
| author_facet | Yue Wang Jinhong Lü Dongqing Feng Sen Guo Jianfa Li |
| author_sort | Yue Wang |
| collection | DOAJ |
| description | The application of biosorption in the removal of heavy metals from water faces a challenge of safe disposal of contaminated biomass. In this study, a potential solution for this problem was proposed by using a biosorption-pyrolysis process featured by pretreatment of biomass with phosphoric acid (PA). The PA pretreatment of biomass increased the removal efficiency of heavy metal Pb from water by sorption, and subsequent pyrolysis helped immobilize Pb in the residual char. The results indicate that most (>95%) of the Pb adsorbed by the PA-pretreated biomass was retained in the char, and that the lower pyrolysis temperature (350 °C) is more favorable for Pb immobilization. In this way, the bioavailable Pb in the char was hardly detected, while the Pb leachable in acidic solution decreased to <3% of total Pb in the char. However, higher pyrolysis temperature (450 °C) is unfavorable for Pb immobilization, as both the leachable and bioavailable Pb increased to >28%. The reason should be related to the formation of elemental Pb and unstable Pb compounds during pyrolysis at 450 °C, according to the X-ray diffraction study. |
| first_indexed | 2024-03-10T16:50:11Z |
| format | Article |
| id | doaj.art-d4f65f584cfa459495e865d728de83a7 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T16:50:11Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
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| series | Water |
| spelling | doaj.art-d4f65f584cfa459495e865d728de83a72023-11-20T11:20:52ZengMDPI AGWater2073-44412020-08-01129238110.3390/w12092381A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the CharYue Wang0Jinhong Lü1Dongqing Feng2Sen Guo3Jianfa Li4College of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, ChinaCollege of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, ChinaCollege of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, ChinaCollege of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, ChinaCollege of Chemistry and Chemical Engineering, Shaoxing University, Zhejiang 312000, ChinaThe application of biosorption in the removal of heavy metals from water faces a challenge of safe disposal of contaminated biomass. In this study, a potential solution for this problem was proposed by using a biosorption-pyrolysis process featured by pretreatment of biomass with phosphoric acid (PA). The PA pretreatment of biomass increased the removal efficiency of heavy metal Pb from water by sorption, and subsequent pyrolysis helped immobilize Pb in the residual char. The results indicate that most (>95%) of the Pb adsorbed by the PA-pretreated biomass was retained in the char, and that the lower pyrolysis temperature (350 °C) is more favorable for Pb immobilization. In this way, the bioavailable Pb in the char was hardly detected, while the Pb leachable in acidic solution decreased to <3% of total Pb in the char. However, higher pyrolysis temperature (450 °C) is unfavorable for Pb immobilization, as both the leachable and bioavailable Pb increased to >28%. The reason should be related to the formation of elemental Pb and unstable Pb compounds during pyrolysis at 450 °C, according to the X-ray diffraction study.https://www.mdpi.com/2073-4441/12/9/2381heavy metalbiosorptionbiocharimmobilizationphosphoric acid |
| spellingShingle | Yue Wang Jinhong Lü Dongqing Feng Sen Guo Jianfa Li A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the Char Water heavy metal biosorption biochar immobilization phosphoric acid |
| title | A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the Char |
| title_full | A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the Char |
| title_fullStr | A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the Char |
| title_full_unstemmed | A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the Char |
| title_short | A Biosorption-Pyrolysis Process for Removal of Pb from Aqueous Solution and Subsequent Immobilization of Pb in the Char |
| title_sort | biosorption pyrolysis process for removal of pb from aqueous solution and subsequent immobilization of pb in the char |
| topic | heavy metal biosorption biochar immobilization phosphoric acid |
| url | https://www.mdpi.com/2073-4441/12/9/2381 |
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